20869421 has 8 divisors (see below), whose sum is σ = 22472640. Its totient is φ = 19307968.

The previous prime is 20869403. The next prime is 20869423. The reversal of 20869421 is 12496802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20869421 - 2¹⁴ = 20853037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9401 + ... + 11406.

It is an arithmetic number, because the mean of its divisors is an integer number (2809080).

Almost surely, 2^20869421 is an apocalyptic number.

It is an amenable number.

20869421 is a deficient number, since it is larger than the sum of its proper divisors (1603219).

20869421 is a wasteful number, since it uses less digits than its factorization.

20869421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20883.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20869421 is about 4568.3061412300. The cubic root of 20869421 is about 275.3193908924.

The spelling of 20869421 in words is "twenty million, eight hundred sixty-nine thousand, four hundred twenty-one".